//package com.yuanfeng.commoms.config;
//
//import com.fasterxml.jackson.core.JsonGenerator;
//import com.fasterxml.jackson.databind.JsonSerializer;
//import com.fasterxml.jackson.databind.ObjectMapper;
//import com.fasterxml.jackson.databind.SerializerProvider;
//import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
//import org.springframework.context.annotation.Bean;
//import org.springframework.context.annotation.Configuration;
//import org.springframework.context.annotation.Primary;
//import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
//
//import java.io.IOException;
//
//
////@Configuration
//public class fastJsonConfig {
//    @Bean
//    @Primary
//    @ConditionalOnMissingBean(ObjectMapper.class)
//    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
//        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
//        // 通过该方法对mapper对象进行设置，所有序列化的对象都将按改规则进行系列化
//        // Include.Include.ALWAYS 默认
//        // Include.NON_DEFAULT 属性为默认值不序列化
//        // Include.NON_EMPTY 属性为 空（""） 或者为 NULL 都不序列化，则返回的json是没有这个字段的。这样对移动端会更省流量
//        // Include.NON_NULL 属性为NULL 不序列化,就是为null的字段不参加序列化
//        //objectMapper.setSerializationInclusion(Include.NON_EMPTY);
//        // 字段保留，将null值转为""
//        objectMapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>() {
//            @Override
//            public void serialize(Object o, JsonGenerator jsonGenerator,
//                                  SerializerProvider serializerProvider)
//                    throws IOException {
//                jsonGenerator.writeString("");
//            }
//        });
//        return objectMapper;
//    }
//}
